Five-Lens Imaging System for High Pixel Resolution
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Solution Overview
Problem
Conventional camera modules with four-lens structures face challenges in achieving high pixel resolution due to reduced pixel size, leading to difficulties in maintaining optical performance.
Innovation Solution
An imaging lens configuration comprising a first biconvex lens with positive power, a second concave lens with negative power, a third biconvex lens, a fourth convex lens with positive power, and a fifth concave lens with negative power, where the lenses are sequentially disposed and formed with specific curvature radii and shapes to optimize optical characteristics, including a stop positioned closer to the object or image side to adjust focal length and reduce chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a four-lens structure is used to achieve high pixel resolution, then resolution is improved, but the lens structure becomes complex and difficult to manufacture with reduced pixel sizes
Solution Approach 1:
The patent divides the imaging lens into five separate lens elements (first through fifth lenses) with specific power configurations (positive, negative, positive, positive, negative). This segmentation allows each lens element to be optimized independently for specific optical functions, achieving high resolution while managing overall system complexity through modular design.
Solution Approach 2:
Each lens element is assigned a specific shape and power configuration tailored to its position in the optical path. The first lens is biconvex with positive power, the second is concave with negative power, and so on. This local optimization of each component's properties enables the entire system to achieve high pixel resolution despite the constraints of reduced pixel sizes.
2Reliability
If more lens elements are added to improve optical performance, then optical characteristics are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element, including curvature radii (e.g., first lens object-side curvature radius and image-side curvature radius with specific relationships), thicknesses, and power values. By defining these parameters within optimized ranges, the patent achieves high optical performance while establishing clear manufacturing specifications that guide precision fabrication processes.
Solution Approach 2:
The patent employs specific curvature configurations for each lens element, such as the first lens being biconvex with defined curvature radius relationships, and the fifth lens having a sweep angle constraint. These curvature specifications enable high optical performance while providing clear geometric guidelines for manufacturing processes.
3Reliability
If lens curvature is increased to reduce chromatic aberration, then optical performance is improved, but internal reflection increases
Solution Approach 1:
The patent strategically positions the fifth lens with negative power and specific curvature characteristics (sweep angle ≤ 46°) at the image-side of the optical system. This configuration converts the potential harm of internal reflection into a benefit by using the fifth lens to correct aberrations while its specific angular design minimizes total internal reflection effects, thereby reducing harmful reflections.
Solution Approach 2:
The patent employs a composite lens structure with five different lens elements, each having specific power and shape characteristics. This composite approach allows different lens elements to address different optical issues: positive power lenses for convergence, negative power lenses for divergence and aberration correction, and specific curvature configurations for minimizing reflections while correcting chromatic aberration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The configuration achieves high resolution, slim size, and improved optical performance by minimizing chromatic aberration and internal reflection, while maintaining productivity and reducing aberration characteristics.
Implementation Method 1
a first lens having positive (+) power and being biconvex; a second lens having negative (−) power and being concave toward an image side; a third lens having positive (+) power and being biconvex; a fourth lens having positive (+) power and being convex toward the image side; and a fifth lens having negative (−) power and being concave toward the image side
Data Source
AI summary
Disclosed herein is an imaging lens, including: a first lens having positive (+) power and being biconvex; a second lens having negative (−) power and being concave toward an image side; a third lens having positive (+) power and being biconvex; a fourth lens having positive (+) power and being convex toward the image side; and a fifth lens having negative (−) power and being concave toward the image side, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are sequentially disposed from an object side.